Flood flow simulations and return period calculation for the Kota Tinggi watershed, Malaysia

J. Abdullah, Nur Shazwani Muhammad, P. Y. Julien, J. Ariffin, A. Shafie

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The City of Kota Tinggi in Malaysia was under more than 5m of water during the floods in December 2006 and January 2007. The watershed received between 280 and 530mm of rain in 4days. These extreme events occurred 3weeks apart and caused extensive damages. The application of the fully distributed two-dimensional model two-dimensional runoff, erosion and export (TREX) to simulate these events and the estimation of the return period of such extreme events are the main objectives of this study. The model performance was very good based on the relative percentage different (3.7%), percent BIAS (overestimated the volume by 1.5%) and Nash-Sutcliffe efficiency coefficient (0.8). The TREX model is successful in simulating extreme flood events. The December 2006 rainstorm event at Kota Tinggi is extremely rare, and this multiday rainstorm had an estimated return period greater than 2000years. The analysis of the return period shows that multiday rainstorms occur more frequently than single-day events. In addition, we produce a flood threshold graph by integrating both the hydrological modelling process using TREX and the theoretical formulation of return period. The proposed flood threshold graph is useful in the estimation of the amount of accumulated rainfall from multiday rainfall that can cause flooding on a large watershed like Kota Tinggi.

Original languageEnglish
JournalJournal of Flood Risk Management
DOIs
Publication statusAccepted/In press - 2016

Fingerprint

Flow simulation
return period
Watersheds
Malaysia
rainstorm
natural disaster
Runoff
watershed
Rain
Erosion
simulation
event
extreme event
runoff
erosion
rainfall
hydrological modeling
flooding
damage
calculation

Keywords

  • Extreme events
  • Hydrological modelling
  • Joint probability
  • Monsoon

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Environmental Engineering
  • Water Science and Technology
  • Geography, Planning and Development

Cite this

Flood flow simulations and return period calculation for the Kota Tinggi watershed, Malaysia. / Abdullah, J.; Muhammad, Nur Shazwani; Julien, P. Y.; Ariffin, J.; Shafie, A.

In: Journal of Flood Risk Management, 2016.

Research output: Contribution to journalArticle

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